Subpixel Electrode Structures for Low-Reflectance OLED Displays
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Solution Overview
Problem
Existing organic light emitting display devices face issues with uneven reflectance reduction across subpixels due to the same anode structure being used for different wavelength emissions, leading to noticeable reflections in bright environments.
Innovation Solution
The display apparatus features subpixels with distinct electrode structures, including light-absorbing layers and transflective electrodes, to differently manage external light reflection, optimizing reflectance reduction for each subpixel based on its emission wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same anode electrode structure is used in all subpixels, then the manufacturing process is simple, but the reflectance reduction efficiency is uneven across different wavelength bands
Solution Approach 1:
The patent applies different electrode structures to different subpixels based on their specific wavelength requirements. Red subpixels use a first electrode structure, green subpixels use a second electrode structure, and blue subpixels use a third electrode structure. Each structure is optimized for its specific wavelength band to achieve uniform reflectance reduction across all subpixels.
Solution Approach 2:
The patent segments the electrode structure design by dividing subpixels into different groups based on their emission wavelengths. By segmenting the electrode configurations into multiple types (first, second, and third electrode structures), the patent enables tailored reflectance reduction for each wavelength band while maintaining manufacturing feasibility.
2Ease of manufacture
If a simple electrode structure is used, then the manufacturing cost is low, but external light reflections are noticeably visible in bright environments
Solution Approach 1:
The patent implements localized electrode structure optimization where each subpixel type (red, green, blue) receives a specifically designed electrode structure tailored to its wavelength characteristics. This local customization reduces external light reflectance effectively for each subpixel type without requiring complete restructuring of all electrodes, thereby controlling manufacturing costs.
Solution Approach 2:
The patent modifies electrode structure parameters (such as pattern, material composition, or geometric configuration) specifically for different wavelength bands. By changing these parameters locally for red, green, and blue subpixels, the patent achieves effective reflectance reduction across the visible spectrum while avoiding the need for a completely complex uniform structure.
3Manufacturing precision
If different electrode structures are used for each subpixel, then reflectance reduction efficiency is optimized for each wavelength, but the device complexity increases
Solution Approach 1:
The patent applies different electrode structures only where necessary - specifically for red, green, and blue subpixels that have different wavelength requirements. This localized differentiation optimizes reflectance reduction efficiency for each wavelength band while limiting complexity to only the necessary subpixels rather than uniformly complicating the entire display structure.
Solution Approach 2:
The patent segments the display into subpixel groups that share the same electrode structure characteristics. By grouping subpixels with similar wavelength requirements together and assigning them matching electrode structures, the patent reduces the overall variety of structures needed while still achieving wavelength-optimized reflectance reduction for each group.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces external light reflectance, enhancing visibility by dispersing reflected light in various directions and minimizing its impact on the viewer, particularly in bright conditions.
Implementation Method 1
a first electrode provided in each of the first subpixel and the second subpixel on the substrate
Implementation Method 2
effectively reduces external light reflectance, enhancing visibility by dispersing reflected light in various directions
Data Source
AI summary
A display apparatus can include a first subpixel and a second subpixel disposed on a substrate; a first electrode in each of the first subpixel and the second subpixel; a light-emitting layer on the first electrode in each of the first and second subpixels; and a second electrode on the light-emitting layer, in which a structure of the first electrode in the first subpixel is different than a structure of the first electrode in the second subpixel.